Locale2MUI 2.6 Requires Restart
by Nick Heim
Sets Firefox/Thunderbird Locale to Windows (MUI) Language on startup
About this Add-on
This extension will not be ported to Webextensions. With FF57, the pref "intl.locale.matchOS" works now as it should on the Windows-version of FF (thanks, Zibi!). So, there is finally no need for this extension anymore.